The Mars Sample Return (MSR) concept is a campaign of three missions: a sample acquisition/caching rover mission, a lander mission to fetch the cache and deliver it to Mars orbit via a rocket, and an orbiter that would capture the orbiting sample (OS) container and deliver it to Earth via an Earth entry vehicle (EEV). A fourth component is the Mars Returned Sample Handling (MRSH) element that would include a sample receiving facility (SRF) and a curation facility. These elements are represented in three separate mission concept study reports:
-Mars 2018 MAX-C Caching Rover 
-MSR Lander Mission 
-MSR Orbiter Mission (including MRSH)
The latter concept is the subject of this report.